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A single sub-km Kuiper Belt object from a stellar Occultation in archival data
H. E. Schlichting, E. O. Ofek, M. Wenz +5
The Kuiper belt is a remnant of the primordial Solar System. Measurements of its size distribution constrain its accretion and collisional history, and the importance of material s…
Detectability of Oort cloud objects using Kepler
Eran O. Ofek, Ehud Nakar
The size distribution and total mass of objects in the Oort Cloud have important implications to the theory of planets formation, including the properties of, and the processes tak…
Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482
M. Zub, A. Cassan, D. Heyrovsky +47
Aims: We present a detailed analysis of OGLE 2004-BLG-482, a relatively high-magnification single-lens microlensing event which exhibits clear extended-source effects. These events…
Unveiling the Origin of GRB 090709A: Lack of Periodicity in a Reddened Cosmological Long-Duration Gamma-Ray Burst
S. B. Cenko, N. R. Butler, E. O. Ofek +15
We present broadband (gamma-ray, X-ray, near-infrared, optical, and radio) observations of the gamma-ray burst (GRB) 090709A and its afterglow in an effort to ascertain the origin…
Space and velocity distributions of Galactic isolated old Neutron stars
E. O. Ofek
I present the results of Monte-Carlo orbital simulations of Galactic Neutron Stars (NSs). The simulations take into account the up-to-date observed NS space and velocity distributi…
Long duration radio transients lacking optical counterparts are possibly Galactic Neutron Stars
E. O. Ofek, B. Breslauer, A. Gal-Yam +4
(abridged) Recently, a new class of radio transients in the 5-GHz band was detected by Bower et al. We present new deep near-Infrared (IR) observations of the field containing thes…
Hydrogen-poor superluminous stellar explosions
R. M. Quimby, S. R. Kulkarni, M. M. Kasliwal +24
Supernovae (SNe) are stellar explosions driven by gravitational or thermonuclear energy, observed as electromagnetic radiation emitted over weeks or more. In all known SNe, this ra…
Mass measurement of a single unseen star and planetary detection efficiency for OGLE 2007-BLG-050
V. Batista, Subo Dong, A. Gould +93
We analyze OGLE-2007-BLG-050, a high magnification microlensing event (A ~ 432) whose peak occurred on 2 May, 2007, with pronounced finite-source and parallax effects. We compute p…
The Palomar Transient Factory: System Overview, Performance and First Results
N. M. Law, S. R. Kulkarni, R. G. Dekany +38
The Palomar Transient Factory (PTF) is a fully-automated, wide-field survey aimed at a systematic exploration of the optical transient sky. The transient survey is performed using…
Exploring the Optical Transient Sky with the Palomar Transient Factory
Arne Rau, Shrinivas R. Kulkarni, Nicholas M. Law +21
The Palomar Transient Factory (PTF) is a wide-field experiment designed to investigate the optical transient and variable sky on time scales from minutes to years. PTF uses the CFH…
A new gravitational lens from the MUSCLES survey: ULAS J082016.1+081216
Neal Jackson, Eran O. Ofek, Masamune Oguri
We present observations of a new double-image gravitational lens system, ULAS J082016.1+081216, of image separation 2.3" and high (~6) flux ratio. The system is selected from the S…
A faint type of supernova from a white dwarf with a helium-rich companion
H. B. Perets, A. Gal-Yam, P. Mazzali +25
Supernovae (SNe) are thought to arise from two different physical processes. The cores of massive, short-lived stars undergo gravitational core collapse and typically eject a few s…
The Collimation and Energetics of the Brightest Swift Gamma-Ray Bursts
S. B. Cenko, D. A. Frail, F. A. Harrison +22
Long-duration gamma-ray bursts (GRBs) are widely believed to be highly-collimated explosions (opening angle theta ~ 1-10 deg). As a result of this beaming factor, the true energy r…
The Host Galaxies of Swift Dark Gamma-Ray Bursts: Observational Constraints on Highly Obscured and Very High-Redshift GRBs
D. A. Perley, S. B. Cenko, J. S. Bloom +13
In this work we present the first results of our imaging campaign at Keck Observatory to identify the host galaxies of "dark" gamma-ray bursts (GRBs), events with no detected optic…